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<html lang="en" xmlns:th="http://www.thymeleaf.org">


<nav class="my-2 my-md-0 mr-md-3" th:fragment="sign">
    <span class="p-2" style="color:#7f8c8d">论文管理系统</span>
    <span class="p-2"  style="color:#7f8c8d">第九组</span>
    <span class="p-2" th:if="${session.uid != null}" th:text="${'Hi,' + session.username}" style="color: #7f8c8d"></span>
    <span class="p-2" th:if="${session.type != null}" th:text="${session.type}"  style="color:#7f8c8d"></span>
</nav>

</html>